CN109630192A - A kind of precipitation method suitable for the construction of half diagenesis bored tunnel - Google Patents

A kind of precipitation method suitable for the construction of half diagenesis bored tunnel Download PDF

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Publication number
CN109630192A
CN109630192A CN201811287207.6A CN201811287207A CN109630192A CN 109630192 A CN109630192 A CN 109630192A CN 201811287207 A CN201811287207 A CN 201811287207A CN 109630192 A CN109630192 A CN 109630192A
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CN
China
Prior art keywords
precipitation
construction
bored tunnel
diagenesis
well casing
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811287207.6A
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Chinese (zh)
Inventor
蒋盼平
罗文静
翟利华
刘建美
邹成璐
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Guangzhou Metro Design and Research Institute Co Ltd
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Guangzhou Metro Design and Research Institute Co Ltd
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Application filed by Guangzhou Metro Design and Research Institute Co Ltd filed Critical Guangzhou Metro Design and Research Institute Co Ltd
Priority to CN201811287207.6A priority Critical patent/CN109630192A/en
Publication of CN109630192A publication Critical patent/CN109630192A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F16/00Drainage
    • E21F16/02Drainage of tunnels

Abstract

A kind of precipitation method suitable for the construction of half diagenesis bored tunnel disclosed by the invention, it is punched downwards by drilling machine and transfers well casing and precipitation is carried out to the stratum for being intended to precipitation region, layering precipitation can be carried out to stratum by adjusting the predetermined depth of pore-forming, and the section of bored tunnel can be avoided according to the actual situation, it avoids having an impact bored tunnel, it can also can carry out before bored tunnel is implemented, without carrying out complicated equipment installation, and dewatering effect is verified by inspecting hole, Engineering Reliability is high, good dewatering effect has been reached to strutum of semi-rock, and to perched water layer, water table aquifer is blocked using clay, effectively reduce earth's surface soil erosion, reduce surface subsidence risk.

Description

A kind of precipitation method suitable for the construction of half diagenesis bored tunnel
Method field
The invention belongs to constructing tunnel fields, relate generally to a kind of precipitation side suitable for the construction of half diagenesis bored tunnel Method.
Background method
Half diagenesis is a kind of Special Rock of incomplete sedimentary metamorphic of third system, pressure higher with intensity under native state The features such as contracting is low, weatherability is weak meets water and easily softens disintegration, and dehydration is air-dried easily dry and cracked, then the just disintegration completely that absorbs water, by force Degree drastically reduces, and especially siltstone and argillaceous siltstoue meet water and easily form quicksand, and saturation terminal compression strength of the single axle fr≤ 5MPa belongs to ultimate soft rock.The underground water of the ground belongs to clastic rock pores gap crevice water, has pressure-bearing property, and watery is weak~medium, Belong to weak~medium pervious bed.
Currently, the prior art generally uses complete (partly) section slip casting in stratum implementation big cross section buried bored tunnel Or the method for precipitation solves problem of groundwater in hole, but since half diagenesis is in thick-layer shape, structural plane is combined preferably, using complete When (partly) section slip casting, no matter all it is difficult to reach compensation ground crack using protrusive or retrusive slip casting, obstructs clastic rock class The purpose of hole crevice water seepage flow, and easily cause underground water pollution;And when using the method for precipitation in hole, need to carry out complexity Equipment installation, timeliness is poor, and is limited to space in hole, and precipitation range and drawdown are difficult to meet excavation face tunneling boring precipitation Demand, while needing to continue precipitation before two lining closings, equipment will affect two linings and the construction of outsourcing flexible water in hole.
Summary of the invention
Present invention aims at the defects for being directed to existing method, provide a kind of drop suitable for the construction of half diagenesis bored tunnel Water method, Engineering Reliability is high, has reached good dewatering effect to strutum of semi-rock, has effectively reduced earth's surface soil erosion, drops Low land face settles risk.
In order to solve the above technical problems, the present invention by the following method implemented by scheme:
A kind of precipitation method suitable for the construction of half diagenesis bored tunnel, comprising the following steps:
S1, multiple well locations are demarcated on the ground in the desire precipitation region of bored tunnel to be implemented;
S2, in each well location rigging up;
S3, it is drilled into predetermined depth to underground in the well location using the drilling machine, forms pore-forming;
S4, well casing is transferred in the pore-forming;The well casing includes sealing pipe portion and drainage pipe portion, the pipe of the drainage pipe portion Wall is provided with filter opening;The drainage pipe portion is wrapped with strainer;The height of the filter pipe should be less than or be equal to the desire precipitation area The desire precipitation in domain ground layer height;
Gap filling gravel material between the outer wall of S5, Xiang Suoshu well casing and the pore-forming, the packed height of the gravel material are answered small In the predetermined depth;The packed height of the gravel material should be higher than that or equal to the drainage pipe portion height;
Gap filling clay between the outer wall of S6, Xiang Suoshu well casing and the pore-forming binds to ground;
S7, the well casing is cleaned;
S8, it is drawn water by the well casing to the stratum for being intended to precipitation region using water pump.
It further, further include burying mouth guard tube in the well location, the mouth guard tube is above ground level in the step S1 0.10m~0.30m.
Further, when installing the drilling machine in the step S2, the board of the drilling machine should keep firm level, described The hook of drilling machine is directed at the center to be drilled, the hook of the drilling machine, the drilling machine center of turntable and described to be drilled 3 points of the heart at a vertical line.
Further, further include in the step S3, during the drill hole of drilling machine using change slurry processes carry out borehole cleaning.
Further, further include in the step S4, when transferring the well casing, in the top and bottom of the drainage pipe portion The centralizer that a set of diameter is less than aperture 10cm is respectively set, to guarantee that drainage pipe portion can be placed centrally in the pore-forming.
Further, in the step S6 before include, by the clay smash to pieces to its partial size be less than 3cm.
Further, the well casing is cleaned using the mode of combined washing well method in the step S7.
Further, the step S8 includes:
S81, the well casing is evacuated using vacuum pump, causes negative pressure in the well casing;
S82, it is drawn water by the well casing to the stratum for being intended to precipitation region using suction pump.
Further, the well casing further includes sand setting pipe portion, and the sand setting pipe portion is arranged below the filter pipe portion.
Further, further includes:
S9, the water pump are connected with pipeline, are drained into the water that the water pump is extracted out by the pipeline preset outside place In irrigation canals and ditches.
Compared with the conventional method, vantageous methods effect of the invention is as follows:
A kind of precipitation method suitable for the construction of half diagenesis bored tunnel disclosed by the invention, is punched downwards simultaneously by drilling machine It transfers well casing and precipitation is carried out to the stratum for being intended to precipitation region, layering drop can be carried out to stratum by adjusting the predetermined depth of pore-forming Water, and can avoid the section of bored tunnel according to the actual situation, avoids having an impact bored tunnel, can also be can be dark It holes and implements preceding development, verify dewatering effect without carrying out complicated equipment installation, and by inspecting hole, Engineering Reliability is high, Good dewatering effect has been reached to strutum of semi-rock, and perched water layer, water table aquifer have been blocked using clay, has been effectively reduced Table soil erosion reduces surface subsidence risk.
Detailed description of the invention
The step of Fig. 1 is a kind of heretofore described precipitation method suitable for the construction of half diagenesis bored tunnel is illustrated Figure;
Fig. 2 is the scheme of installation of heretofore described well casing;
Fig. 3 is the dewatering effect sectional view of heretofore described well casing.
Specific embodiment
In order to be fully understood from the purpose of the present invention, feature and effect, below with reference to attached drawing and specific embodiment pair The method effect of design of the invention, specific steps and generation is described further.
As shown in Figure 1, the invention discloses a kind of precipitation method suitable for the construction of half diagenesis bored tunnel, including it is following Step:
S1, multiple well locations are demarcated on the ground in the desire precipitation region of bored tunnel to be implemented;It, should be by during practice of construction According to well location plan view measuring well location, if site operation encounters obstacle in the process or the influence by execution conditions shows Field can make the appropriate adjustments, but well location cannot be in support, stabilization zone.Specifically, also to bury mouth guard tube in well location, prevent from constructing When pipe is outer returns slurry, mouth guard tube answers 0.1m~0.3m above ground level when burying.By above-mentioned setting, mouth guard tube can assist rotary drilling rig Initial stage into Kong Dingwei, prevents inclined hole, while superficial part bad ground (miscellaneous fill, weak soil, steady layer of water etc.) being isolated, and prevents from collapsing Hole;Earth's surface water table aquifer can be also isolated in it, so that water table aquifer is not polluted by drilling machine liquid, mud etc..
S2, in each well location rigging up;Practice of construction can be used it is outstanding dig drilling machine, when rigging up, the board of drilling machine should be protected The solid water that keeps steady is flat, and the hook of drilling machine is directed at the center to be drilled, the hook of drilling machine, the center of turntable of drilling machine and the center to be drilled 3 points at a vertical line.
S3, it is drilled into predetermined depth to underground in well location using drilling machine, forms pore-forming;During practice of construction, predetermined depth It can be adjusted according to the aqueous layer depth for being intended to precipitation region, while the section of bored tunnel should be avoided, specific drill hole of drilling machine During using change slurry processes carry out borehole cleaning;In order to guarantee that pore-forming is not forming blocked up mudcake into water-bearing layer position, work as brill Start when machine drill to the water-bearing layer ceiling location for being intended to precipitation region plus clear water is sized mixing.After drilling to predetermined depth, before mentioning brill Drilling rod is mentioned to from bottom hole 0.50m, is punched out, sundries in cleaning hole, while the mud density in hole being gradually adjusted to approach 1.05g/cm3, heavy become silted up of bottom hole is less than 30cm, without until mud in the mud returned out.
Specifically, the schematic diagram that well casing is arranged in following steps S4-S9 is as shown in Figure 2:
S4, well casing 2 is transferred in pore-forming 1;Well casing 2 includes sealing pipe portion 21 and drainage pipe portion 22, the tube wall of drainage pipe portion 22 It is provided with filter opening 221;Drainage pipe portion is wrapped with strainer 222;The height of filter pipe 22 should be less than or equal to the desire for being intended to precipitation region Precipitation ground layer height;Specifically, 22 subordinate of filter pipe of well casing 2 is additionally provided with sand setting pipe portion 23, when transferring well casing 2, in drainage The centralizer that a set of diameter is less than aperture 10cm is respectively arranged in the top and bottom of pipe portion 22, to guarantee that drainage pipe portion can be in pore-forming It is placed centrally;The setting of sand setting pipe portion be in order to which the sand setting generated in well casing decentralization process is isolated, it is direct to prevent sand setting It results in blockage into drainage pipe portion.
During practice of construction, decentralization well casing process should be carried out continuously, and must not be stopped halfway, such as because of mechanical breakdown reason It causes to collapse in hole or precipitate blocked up, well casing should be extracted again, tripping in again after cleaning bottom of hole, borehole cleaning is forbidden by force to insert well casing Enter bottom hole of collapsing.
Gap filling gravel material 3 between the outer wall and pore-forming 1 of S5, Xiang Jingguan 2, the packed height of gravel material 3 should be less than default deep Degree;The packed height of gravel material 3 should be higher than that or equal to drainage pipe portion 22 height;Pass through above-mentioned setting, the gravel material and drainage of filling Pipe portion plays the role of filtering underground together, to prevent to take excessive silt out of when drawing water;Meanwhile in practice of construction, apply Worker person can select the gravel material of different gradation according to soil property, reach best filter effect.
In practice of construction, fill out before gravel material using the depth inside and outside lining rope measurement well casing, sand setting is not to be exceeded in the difference of the two The length of pipe portion, so can avoid extra sand setting blocking drainage pipe portion while filling out gravel material in the process should be with the height filled out with survey gravel material Degree.Filling out gravel material process should also be carried out continuously, and must not terminate halfway, until gravel material tripping in predetermined position.
Gap filling clay 4 between the outer wall and pore-forming 1 of S6, Xiang Jingguan 2 binds to ground;Specifically, practice of construction In, it is bound using plain concrete to well casing;Specifically, being answered before step S6 to prevent from enclosing generation " bridge formation " phenomenon when filling out Clay 4 is smashed to pieces and is inserted after being less than 3cm to its partial size.Running speed and quantity should be controlled by enclosing when filling out, few along pressing around well casing Principle under slowing down, which is enclosed, fills out.Then closing work is carried out outside well head pipe.
S7, well casing 2 is cleaned;Specifically, the mode using combined washing well method cleans well casing 2.
S8, it is drawn water using the stratum that water pump is intended to precipitation region by 2 pairs of well casing.
Specifically, the specific implementation step of step S8 includes:
S81, well casing 2 is evacuated using vacuum pump 5, certain negative pressure is caused in well casing 2;
S82, it is drawn water using the stratum that suction pump 6 is intended to precipitation region by 2 pairs of well casing.
By implementation steps S81-S82, is drawn water using vacuum pump negative pressure caused by well casing, the pumping of suction pump can be made Water effect is more preferable, increases the efficiency of work.
S9, suction pump 6 are connected with pipeline 7, and the water that suction pump 6 is extracted out is drained into preset irrigation canals and ditches outside place by pipeline 7 In.In practice of construction, water is discharged into over-the-counter preset drainage ditch by gutter (canal), the drainage pipeline of place surrounding is answered Timing clear up, it is ensured that drainage system it is unimpeded.
Specifically, actual implementation effect, as shown in figure 3, reality can be passed through according to the region and position of proposed bored tunnel Step S1-S9 is applied, bored tunnel is avoided and drills, well casing is avoided into proposed bored tunnel and is installed to arch bottom hereinafter, to tunneling Clastic rock pores crazing gap water layer locating for tunnel carries out layering precipitation, so that practical in locating half diagenesis before bored tunnel construction Water level line is in proposed tunnel inverted arch or less.
By disclosed in present embodiment it is a kind of suitable for half diagenesis bored tunnel construction precipitation method, by drilling machine to Lower punching simultaneously transfers well casing to the stratum progress precipitation for being intended to precipitation region, can carry out by adjusting the predetermined depth of pore-forming to stratum It is layered precipitation, and the section of bored tunnel can be avoided according to the actual situation, avoids having an impact bored tunnel, it can also be It can carry out before bored tunnel is implemented, without carrying out complicated equipment installation, and dewatering effect be verified by inspecting hole, engineering is reliable Property it is high, good dewatering effect has been reached to strutum of semi-rock, and to perched water layer, water table aquifer using clay closure, effectively Earth's surface soil erosion is reduced, surface subsidence risk is reduced.
The preferred embodiment of the present invention has been described in detail above, it should be understood that the commonsense method personnel of this field without It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, method in all this method fields Personnel pass through logic analysis, reasoning or available according to limited experiment according to present inventive concept on the basis of existing method Method scheme, should be among the protection scope determined by the claims.

Claims (10)

1. a kind of precipitation method suitable for the construction of half diagenesis bored tunnel, which comprises the following steps:
S1, multiple well locations are demarcated on the ground in the desire precipitation region of bored tunnel to be implemented;
S2, in each well location rigging up;
S3, it is drilled into predetermined depth to underground in the well location using the drilling machine, forms pore-forming;
S4, well casing is transferred in the pore-forming;The well casing includes that sealing pipe portion and drainage pipe portion, the tube wall of the drainage pipe portion are opened There is filter opening;The drainage pipe portion is wrapped with strainer;The height of the filter pipe is less than or equal to the desire for being intended to precipitation region Precipitation ground layer height;
Gap filling gravel material between the outer wall of S5, Xiang Suoshu well casing and the pore-forming, the packed height of the gravel material should be less than institute State predetermined depth;The packed height of the gravel material should be higher than that or equal to the drainage pipe portion height;
Gap filling clay between the outer wall of S6, Xiang Suoshu well casing and the pore-forming binds to ground;
S7, the well casing is cleaned;
S8, it is drawn water by the well casing to the stratum for being intended to precipitation region using water pump.
2. the precipitation method according to claim 1 suitable for the construction of half diagenesis bored tunnel, which is characterized in that the step It further include burying mouth guard tube, the mouth guard tube 0.10m~0.30m above ground level in the well location in rapid S1.
3. the precipitation method according to claim 1 suitable for the construction of half diagenesis bored tunnel, which is characterized in that the step When installing the drilling machine in rapid S2, the board of the drilling machine should keep firm level, what the hook alignment of the drilling machine to be drilled Center, the hook of the drilling machine, the center of turntable of the drilling machine and 3 points of the center to be drilled are at a vertical line.
4. the precipitation method according to claim 1 suitable for the construction of half diagenesis bored tunnel, which is characterized in that the step It further include carrying out borehole cleaning using changing slurry processes during the drill hole of drilling machine in rapid S3.
5. the precipitation method according to claim 1 suitable for the construction of half diagenesis bored tunnel, which is characterized in that the step It further include that when transferring the well casing, a set of diameter is respectively set less than aperture in the top and bottom of the drainage pipe portion in rapid S4 The centralizer of 10cm.
6. the precipitation method according to claim 1 suitable for the construction of half diagenesis bored tunnel, which is characterized in that described It include that the clay is smashed to pieces to its partial size and is less than 3cm before in step S6.
7. the precipitation method according to claim 1 suitable for the construction of half diagenesis bored tunnel, which is characterized in that the step The well casing is cleaned using the mode of combined washing well method in rapid S7.
8. the precipitation method according to claim 1 suitable for the construction of half diagenesis bored tunnel, which is characterized in that the step Suddenly S8 includes:
S81, the well casing is evacuated using vacuum pump, causes negative pressure in the well casing;
S82, it is drawn water by the well casing to the stratum for being intended to precipitation region using suction pump.
9. the precipitation method according to claim 1 suitable for the construction of half diagenesis bored tunnel, which is characterized in that the well Pipe further includes sand setting pipe portion, and the sand setting pipe portion is arranged below the filter pipe portion.
10. the precipitation method according to claim 1 suitable for the construction of half diagenesis bored tunnel, which is characterized in that also wrap It includes:
S9, the water pump are connected with pipeline, and the water that the water pump is extracted out is drained into preset irrigation canals and ditches outside place by the pipeline In.
CN201811287207.6A 2018-10-31 2018-10-31 A kind of precipitation method suitable for the construction of half diagenesis bored tunnel Pending CN109630192A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110985120A (en) * 2019-12-31 2020-04-10 中铁十六局集团北京轨道交通工程建设有限公司 Precipitation construction method and system for tunnel connection channel of fractured clay layer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104032760A (en) * 2013-03-05 2014-09-10 李孝虎 Foundation pit construction tube well dewatering method
CN104762981A (en) * 2015-02-16 2015-07-08 中交一航局第一工程有限公司 Hole forming method of precipitation well
CN104790419A (en) * 2015-03-24 2015-07-22 中铁三局集团有限公司 Dewatering construction method applicable to tunnel in water-rich quicksand stratum
CN107227961A (en) * 2017-06-29 2017-10-03 中铁十二局集团有限公司 Heavy caliber dewatering well construction method in metro built by mining method hole
CN107386308A (en) * 2017-07-26 2017-11-24 浙江省工程勘察院 A kind of side slope slopes automate precipitation method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104032760A (en) * 2013-03-05 2014-09-10 李孝虎 Foundation pit construction tube well dewatering method
CN104762981A (en) * 2015-02-16 2015-07-08 中交一航局第一工程有限公司 Hole forming method of precipitation well
CN104790419A (en) * 2015-03-24 2015-07-22 中铁三局集团有限公司 Dewatering construction method applicable to tunnel in water-rich quicksand stratum
CN107227961A (en) * 2017-06-29 2017-10-03 中铁十二局集团有限公司 Heavy caliber dewatering well construction method in metro built by mining method hole
CN107386308A (en) * 2017-07-26 2017-11-24 浙江省工程勘察院 A kind of side slope slopes automate precipitation method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
孙建新: "减压释能技术在穿越极软岩隧道高压富水区的综合应用", 《铁道建筑技术》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110985120A (en) * 2019-12-31 2020-04-10 中铁十六局集团北京轨道交通工程建设有限公司 Precipitation construction method and system for tunnel connection channel of fractured clay layer

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Application publication date: 20190416